| Checking temperature regulator |
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| Intake air temperature max. 20° C |
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| Join temperature regulator connection (temperature regulator/carburettor) with a correspondingly long vacuum hose to carburettor connection. |
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| Start engine and run at idling speed. Control flap must be pulled on. |
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| Pull vacuum hose from temperature regulator on carburettor. Control flap must have assumed its initial position after max. 20 seconds. |
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